Due will mark as

4. which of the following sentences is a good hypothesis?
a. how does the human heart pump?
b. goat milk tastes better than cow milk.
c. geraniums are able to reproduce asexually.
d. frogs on land are better off than frogs in the water.

5. how many manipulated variables does a controlled experiment have?
a. none
b. only 1
c. between 1 and 5
d. as many as needed

9. which of the following models would be best for weather forecasting?
a. physical model
b. chemical model
c. conceptual model
d. mathematical model